/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.confignode.procedure.impl.trigger;

import org.apache.iotdb.commons.trigger.exception.TriggerManagementException;
import org.apache.iotdb.confignode.consensus.request.write.trigger.DeleteTriggerInTablePlan;
import org.apache.iotdb.confignode.consensus.request.write.trigger.UpdateTriggerStateInTablePlan;
import org.apache.iotdb.confignode.persistence.TriggerInfo;
import org.apache.iotdb.confignode.procedure.env.ConfigNodeProcedureEnv;
import org.apache.iotdb.confignode.procedure.exception.ProcedureException;
import org.apache.iotdb.confignode.procedure.impl.node.AbstractNodeProcedure;
import org.apache.iotdb.confignode.procedure.state.DropTriggerState;
import org.apache.iotdb.confignode.procedure.store.ProcedureType;
import org.apache.iotdb.confignode.rpc.thrift.TTriggerState;
import org.apache.iotdb.rpc.RpcUtils;
import org.apache.iotdb.rpc.TSStatusCode;
import org.apache.iotdb.tsfile.utils.ReadWriteIOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.DataOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;

/**
 * drop trigger procedure
 */
public class DropTriggerProcedure extends AbstractNodeProcedure<DropTriggerState> {
    private static final Logger LOG = LoggerFactory.getLogger(DropTriggerProcedure.class);
    private static final int retryThreshold = 5;

    private String triggerName;

    public DropTriggerProcedure() {
        super();
    }

    public DropTriggerProcedure(String triggerName) {
        super();
        this.triggerName = triggerName;
    }

    @Override
    protected Flow executeFromState(ConfigNodeProcedureEnv env, DropTriggerState state) {
        if (triggerName == null) {
            return Flow.NO_MORE_STATE;
        }
        try {
            switch (state) {
                case INIT:
                    LOG.info("Start to drop trigger [{}]", triggerName);

                    TriggerInfo triggerInfo = env.getConfigManager().getTriggerManager().getTriggerInfo();
                    triggerInfo.acquireTriggerTableLock();

                    triggerInfo.validate(triggerName);

                    env.getConfigManager()
                            .getConsensusManager()
                            .write(new UpdateTriggerStateInTablePlan(triggerName, TTriggerState.DROPPING));
                    setNextState(DropTriggerState.CONFIG_NODE_DROPPING);
                    break;

                case CONFIG_NODE_DROPPING:
                    LOG.info("Start to drop trigger [{}] on Data Nodes", triggerName);

                    // TODO consider using reference counts to determine whether to remove jar
                    if (RpcUtils.squashResponseStatusList(env.dropTriggerOnDataNodes(triggerName, false))
                            .getCode()
                            == TSStatusCode.SUCCESS_STATUS.getStatusCode()) {
                        setNextState(DropTriggerState.DATA_NODE_DROPPED);
                    } else {
                        throw new TriggerManagementException(
                                String.format("Fail to drop trigger [%s] on Data Nodes", triggerName));
                    }
                    break;

                case DATA_NODE_DROPPED:
                    LOG.info("Start to drop trigger [{}] on Config Nodes", triggerName);
                    env.getConfigManager()
                            .getConsensusManager()
                            .write(new DeleteTriggerInTablePlan(triggerName));
                    setNextState(DropTriggerState.CONFIG_NODE_DROPPED);
                    break;

                case CONFIG_NODE_DROPPED:
                    env.getConfigManager().getTriggerManager().getTriggerInfo().releaseTriggerTableLock();
                    return Flow.NO_MORE_STATE;
            }
        } catch (Exception e) {
            if (isRollbackSupported(state)) {
                LOG.error("Fail in DropTriggerProcedure", e);
                setFailure(new ProcedureException(e.getMessage()));
            } else {
                LOG.error(
                        "Retrievable error trying to drop trigger [{}], state [{}]", triggerName, state, e);
                if (getCycles() > retryThreshold) {
                    setFailure(
                            new ProcedureException(
                                    String.format("Fail to drop trigger [%s] at STATE [%s]", triggerName, state)));
                }
            }
        }
        return Flow.HAS_MORE_STATE;
    }

    @Override
    protected void rollbackState(ConfigNodeProcedureEnv env, DropTriggerState state)
            throws IOException, InterruptedException, ProcedureException {
        if (state == DropTriggerState.INIT) {
            LOG.info("Start [INIT] rollback of trigger [{}]", triggerName);

            env.getConfigManager().getTriggerManager().getTriggerInfo().releaseTriggerTableLock();
        }
    }

    @Override
    protected boolean isRollbackSupported(DropTriggerState state) {
        return true;
    }

    @Override
    protected DropTriggerState getState(int stateId) {
        return DropTriggerState.values()[stateId];
    }

    @Override
    protected int getStateId(DropTriggerState dropTriggerState) {
        return dropTriggerState.ordinal();
    }

    @Override
    protected DropTriggerState getInitialState() {
        return DropTriggerState.INIT;
    }

    @Override
    public void serialize(DataOutputStream stream) throws IOException {
        stream.writeShort(ProcedureType.DROP_TRIGGER_PROCEDURE.getTypeCode());
        super.serialize(stream);
        ReadWriteIOUtils.write(triggerName, stream);
    }

    @Override
    public void deserialize(ByteBuffer byteBuffer) {
        super.deserialize(byteBuffer);
        triggerName = ReadWriteIOUtils.readString(byteBuffer);
    }

    @Override
    public boolean equals(Object that) {
        if (that instanceof DropTriggerProcedure) {
            DropTriggerProcedure thatProc = (DropTriggerProcedure) that;
            return thatProc.getProcId() == this.getProcId()
                    && thatProc.getState() == this.getState()
                    && (thatProc.triggerName).equals(this.triggerName);
        }
        return false;
    }
}
